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#3
06-20-2013, 12:35 PM
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Or a 14 1/2 dia. x 17 P might work better...I'd give that one a spin 1st...important you have a working tach and know Evinrude's max recommended RPMs for that motor...a good way to know you have correct prop is that the motor on that boat will spin up to that max RPM...that's not to say you should run it a whole lot at that number, but indication of correct prop...2/3 to 3/4 of that number should be a CRUISE speed...maybe a little higher...when you test, it should be w/light load, 1/2 tank gas, flat water, no to little wind and 1 friend...running in straight line, trim motor up til you hear it start to lose bite and back down one touch...let us know how it does...pictures if ya can!!...
 I've seen several people read this and reply; Oh, I'm never gonna run it at Wide Open Throttle (WOT) like that... and they have missed the whole point...this is only a test...
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'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#5
06-20-2013, 03:38 PM
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My best guess would be if you had a 6cyl OMC to think about a 17" or even a 19" if light loaded. If you got a few big assed buddies a 15" would be necessary.
But being you got a 4cyl the biggest I'd plan for would be a 17" if real light loaded. A 15" might be close to what you need if you got a usual load.
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 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny
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#6
06-20-2013, 09:42 PM
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Are you SURE it's a 85 140 VRO? In 85 there were also a few crossflow engines turned out, and they don't quite have the top end punch and turn less RPM's. For that engine also there are 2 different gear cases that could be on it. A TRUE 85 140 will have the larger V-6 gear case with 2.25:1 gears in it, but most have been swapped out for the smaller 2:1 V4 gear case. you need to pull your current prop off and measure the diameter where it slides into the gear case first. If it is a 4" then it's a V4 gear case, if it's 4 1/2" then it's a V6 gear case. If it's a V6 gear case you also need to make sure it has 2.25:1 gears in it as the V4 doesn't have the bottem end grunt to pull the 1.86:1 V6 gears. If it's a V6 gear case with the 2.25:1 gears then a 17 pitch prop would probably be good. If it has the 1.86:1 gears then find another gear case for it as it will never run right. If it has a V4 gear case then look for a 15 pitch prop for it.
I know you were probably hoping for a simple answer, but with a 140(ESPESCIALLY 85 since it was the 1st year of that engine and a 1 year only if it is a true 85 140 looper) you just don't know what you could have until you check it out.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#7
06-21-2013, 06:43 AM
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Quote:
. V20.com...THE source of THE truth...and we all know the truth will set you FREE...it'll piss you off first, but it will set you free...  Good stuff Ferman...I had an '84 140, so I guess I dodged all that...it was a a great motor on a 17' Thunderbird...
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'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha
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#8
06-21-2013, 07:07 AM
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Found this in classifieds...after Ferm's post, ya never know what ya might need...
http://www.wellcraftv20.com/communit...ad.php?t=19263
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'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha
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